Dual three-phase permanent magnet synchronous machine supplied by two independent voltage source inverters

Comparison of two-individual current control and vector space decomposition control for dual three-phase PMSM

“…The dual three-phase PMSM is considered as two single three-phase machines with mutual coupling [4]. The voltage equations for each single three-phase machine in dq-frame can be expressed as (5) and (6 …”

“…They provide outstanding advantages [4][5][6][7][8], such as reduced phase current rating and torque ripple; a lower DC-link harmonic current; smooth magneto-motive force (MMF); improved efficiency; excellent fault tolerant characteristics and higher reliability at system level.…”

“…1 [10], where the machine has two sets of three-phase windings, one set is designated as ABC, and the other set is XYZ shifted by 30° electrical degrees. Numerous current control strategies have been developed for the dual three-phase drive system [4][5][6][7][11][12][13][14][15][16][17][18]. Two of the most interesting and widely used strategies are the vector space decomposition (VSD) control [11,13,16,17], which treats the machine as a six-phase machine, and the twoindividual current control [4,5,7,12], which treats the machine as two single three-phase machines.…”

“…The two-individual current control is based on the double dq synchronous frames model [4,5,7,12], where there is mutual coupling between the two dq-synchronous frames. Instead of the six-phase VSI, PWM strategies [11,[19][20][21], and complex matrix transformation of VSD control, two individual commercial single three-phase VSI inverters can be employed to drive each set of single three-phase windings in the dual three-phase machine individually.…”

Modelling approaches for triple three-phase permanent magnet machines

“…Reference currents for both three-phase stator windings are generated and applied to the current regulators of each three-phase winding. Similarly, work in [15] introduces a dual-star synchronous machine fed by two independent voltage source converters and implements independent three-phase vector control for each of them. The main problem of these strategies is that having independent current regulators for each three-phase winding yields a complex control structure, since the stator-stator cross-couplings need to be taken into account and compensated for to provide adequate transient response.…”